adapt cosmprund to goleveldb

[techsaavy8784]

Hello, team, hope you are doing well.
I have found one issue while using cosmprund.
This isn't working for goleveldb.
I used --backend=goleveldb but still it was only working for pebbledb.
so I have changed some codes for goleveldb and it is working as well.
Please check this issue and let me know.

Thank you,